15 Billie Eilish Halloween Costume Ideas For All You Bad Guys

Cartoons, but make it fashion. On stage at the 2019 Glastonbury Festival, Billie worn one of her most daring outfits to date. The accessories are key here — the more rings and necklaces you can layer on, the better.

What to wear: A wild graphic print, plus every accessory you can find. Throw on a headband, some silver rings and chain necklaces, sunglasses, and, of course, a surgical mask.